Nice shooting there! My Zombie targets were shot at the 50yd. line as I'm still in the load development stage. The light load will be shot at 100yd. next time, but that will be awhile as I had a cataract removed last week.
I also prefer light loads for my bolt milsurps. I'm only shooting paper Zombies so I see no reason to wear out the rifle or my shoulder. 16g seems to be the sweet spot for 2400 powder. My .308 Spanish Mauser likes that powder/bullet combo the best also. I was amazed at the holes in the target. Looked like they were cut with a paper punch.